CN110350542A - A kind of railway distribution system electric energy quality synthesis compensation apparatus and its control method - Google Patents
A kind of railway distribution system electric energy quality synthesis compensation apparatus and its control method Download PDFInfo
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- CN110350542A CN110350542A CN201910762339.8A CN201910762339A CN110350542A CN 110350542 A CN110350542 A CN 110350542A CN 201910762339 A CN201910762339 A CN 201910762339A CN 110350542 A CN110350542 A CN 110350542A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The present invention provides a kind of railway distribution system comprehensive power quality device and its control methods, belong to electric railway power distribution system quality of electric power Treatment process field.The secondary side of step-down transformer has one group or more of winding, accesses the general compensator CC1 of modularized design, the input terminal of general compensator CC2, general compensator CCn after every group of winding difference tandem reactor, constitutes parallel connection type comprehensive compensation system；The input terminal of digitial controller acquires the output electric current and Support Capacitor voltage of the Loading voltage regulator primary current and three-phase power grid voltage and general compensator in distribution substation by sensor respectively；The switching signal of digitial controller output end output is sent to the control terminal of corresponding general compensator.The separation of positive sequence fundamental current, negative phase-sequence fundamental current and positive and negative sequence harmonic current is realized according to Fundamental-frequency Current detection algorithm；The control to positive sequence fundamental frequency, negative phase-sequence fundamental frequency and deleterious current is realized according to fundamental frequency control algolithm and deleterious current control algolithm.
Description
Technical field
The invention belongs to electric railway power distribution system quality of electric power Treatment process fields.
Background technique
Currently, the reliable power supply in order to ensure line of high-speed railway first order load and synthetic load, 10kV power supply through line
It is laid using full cable.Compared with overhead line, full cable power supply mode have by natural environment influence it is small, do not take up an area face sky
Between, the advantages that power supply reliability is high.But the capacitive earth current of full cable route is 30~100 times of overhead transmission line, capacitor
Effect will cause the power quality problems such as the lifting of line end voltage, idle foldback；If being sent out in the case where isolated neutral
Raw singlephase earth fault, biggish capacitance current will lead to electric arc and be unable to automatic distinguishing.In addition, due to electric power electricity a large amount of on route
The access of the nonlinear-loads such as sub- equipment can generate certain harmonic injection distribution system, cause to generate harmonic wave on transmission line of electricity
The problems such as pressure drop, increase transmission losses.There are also large number of equipment be single-phase load in load, access after power distribution network will generate it is negative
Sequence electric current causes three phase network uneven, reduces the economy of operation of power networks.
The current improvement for railway 10 kV power distribution system power quality focuses mostly in terms of reactive compensation, mainly there is both ends
The dispersion compensation of centralized compensation, dispersion compensation and head end centralized compensation+along the line.Head end centralized compensation in the centralized compensation scheme of both ends
Dynamic reactive compensation device is generallyd use, to adjust the power factor of route head end；Fixed compensation, compensated line is arranged in end
Capacitive reactive power adjusts line end voltage.Both ends centralized compensation equipment is all mounted in the distribution substation at first and last end, plant maintenance letter
It is single, but the voltage of whole route can not be regulated and controled, regulative mode is not flexible.Dispersion compensation scheme can switching reactor dispersion peace
Along power supply through line, the capacity current of cable capacitance effect generation can be reduced, reduce line voltage distribution lifting, regulative mode
Flexibly.But the installation dispersion of program device, operation and maintenance are cumbersome.In head in the dispersion compensation scheme of head end centralized compensation+along the line
End setting dynamic reactive compensation device, along the line setting can switching constant reactance device, combined head end capacitive reactive power compensation
It is adjusted with circuit voltage.But at present the dynamic reactive compensation device in distribution substation using it is multiple can switching reactor constitute, it is former
Fixed compensation is still fallen in reason, can only realize it is idle have grade compensation, easily cause overcompensation or undercompensation.And it can switching reactance
Device can only filter out fractional harmonic, cannot achieve the full compensation of harmonic wave.In addition, it cannot compensate the electricity of negative phase-sequence caused by single-phase load
Stream.Therefore, a kind of power quality harnessed synthetically equipment is needed to solve idle, harmonic wave and negative phase-sequence in railway distribution system
Problem.
Summary of the invention
The object of the present invention is to provide a kind of railway distribution system electric energy quality synthesis compensation apparatus, it can be efficiently solved
The technical issues of idle in distribution substation, harmonic wave and negative-sequence current are accurately compensated.
It is a further object to provide a kind of railway distribution system power quality comprehensive compensation control method, its energy
Efficiently solve the technical issues of idle, harmonic wave and negative-sequence current are accurately compensated in distribution substation.
The purpose of the present invention is achieved through the following technical solutions: a kind of railway distribution system comprehensive power quality benefit
Device is repaid, the primary side three-phase port difference of the comprehensive compensating device CC including step-down transformer T and H bridge structure, step-down transformer T
Couple with the A phase, B phase, C phase of three phase network, the secondary side of the step-down transformer T has one group or more of a winding, every group around
Group respectively tandem reactor La1~La3, reactor Lb1~Lb3 ..., corresponding comprehensive compensation is accessed after reactor Ln1~Ln3
Device CC1, general compensator CC2 ..., the input terminal of general compensator CCn, constitute parallel connection type comprehensive compensating device；It is digital control
The input terminal of device DC acquires the Loading voltage regulator primary current i in distribution substation by sensor respectivelysa、isb、iscAnd three phase network
Voltage ua、ub、ucAnd general compensator CC1, general compensator CC2 ..., the output electric current i of general compensator CCnca1、icb1、
icc1, ica2、icb2、icc2..., ican、icbn、iccnWith Support Capacitor voltage Vdc1, Vdc2..., Vdcn；Digitial controller DC output end
The switching signal PWM1 of output, switching signal PWM2 ..., switching signal PWMn be sent to corresponding general compensator CC1, synthesis
Compensator CC2 ..., the control terminal of general compensator CCn.
General compensator CC1, general compensator CC2 in the comprehensive compensating device CC ..., general compensator CCn it is equal
Using two level H-bridge structures or more level H-bridge structures.
The vice-side winding number of the step-down transformer T is equal to the general compensator set according to the capacity requirement of comprehensive compensation
Number of units.
The function of the comprehensive compensating device, which is realized, to be needed according to Fundamental-frequency Current detection algorithm, first detection three phase network electricity
Press ua、ub、uc, and sine, the cosine value of voltage phase angle needed for obtaining coordinate transform by phase-locked loop pllWith
The product ω t of electrical network angular frequency and time；Then distribution substation's Loading voltage regulator primary current i is acquiredsa、isb、isc, and by just
Sequence dq converts abc-dq and negative phase-sequence dq and converts abc--dq-Respectively obtain electric current isa、isb、iscElectric current shape under positive-sequence coordinate system
Formula i+ p、i+ qWith the current forms i under negative phase-sequence coordinate system- p、i- q, then be respectively fed to low-pass filter to obtain fundamental frequency active and reactive
Positive-sequence component i* p、i* qWith the active and reactive component i of fundamental frequency negative phase-sequence* dN、i* qN, to realize positive sequence fundamental current, negative phase-sequence fundamental wave electricity
The separation of stream and positive and negative sequence harmonic current.
Another object of the present invention is achieved through the following technical solutions: a kind of railway distribution system power quality
The control method of comprehensive compensating device controls three parts comprising the control of positive sequence fundamental frequency, the control of negative phase-sequence fundamental frequency and deleterious current, just
The control of sequence fundamental frequency by acquisition general compensator CC1, general compensator CC2 ..., the output electric current i of general compensator CCnca1、
icb1、icc1, ica2、icb2、icc2..., ican、icbn、iccnWith exchange side voltage ua、ub、ucAnd DC side Support Capacitor voltage
Vdc1、Vdc2..., Vdcn, then combined by the double -loop control of open sea wharf, inner ring current control with dq decoupling control
Mode generates the three-phase reference quantity v of positive sequence voltage* a、v* b、v* c；The control of negative phase-sequence fundamental frequency passes through acquisition general compensator CC1, synthesis
Compensator CC2 ..., the output electric current i of general compensator CCnca1、icb1、icc1, ica2、icb2、icc2..., ican、icbn、iccn, then
Negative sequence voltage three-phase reference quantity v is generated by way of dq decoupling control* aN、v* bN、v* cN；Deleterious current control owns distribution
Voltage adjustment of on-load device primary current isa、isb、iscFundamental component i under dq coordinate system* p、i* qBy dq-abc transformation to its
Form i under abc coordinate systemsfa、isfb、isfc, then use isa、isb、iscSubtract isfa、isfb、isfcThe positive sequence being not compensated for
Harmonic current components and negative sequence harmonic current component iha、ihb、ihc, the three-phase of Unwanted voltage is obtained finally by proportional controller
Reference quantity vha、vhb、vhc.Finally by positive sequence voltage three-phase reference quantity v* a、v* b、v* c, negative sequence voltage three-phase reference quantity v* aN、v* bN、
v* cNWith Unwanted voltage three-phase reference quantity vha、vhb、vhcIt is sent into PWM modulation module after addition, obtains opening for each general compensator
OFF signal.
Therefore, the comprehensive compensating device based on converters is equipped in the electric substation of distribution system, by dropping
Pressure transformer and general compensator are constituted.Step-down transformer primary side three is connected A, B, C three-phase of distribution substation's Loading voltage regulator, secondary
The each winding in side connects general compensator CC1, comprehensive compensation through reactor (La1~La3, Lb1~Lb3 ..., Ln1~Ln3) again
Device CC2 ..., general compensator CCn form distribution substation's electric energy quality synthesis compensation apparatus CC.Comprehensive compensating device passes through sensing
Device acquisition flows into the three-phase current i of distribution substationsa、isb、iscIt is sent into digitial controller DC, digitial controller DC passes through certain electricity
Stream detection algorithm separates reactive component therein, harmonic component and negative sequence component, then passes through fundamental frequency control algolithm
The output of (active reactive control algolithm, fundamental wave negative sequence restrainable algorithms) and deleterious current control algolithm (harmonic wave, negative phase-sequence restrainable algorithms)
Switching signal controls its synthesis for generating one with net side reactive current, harmonic current and negative-sequence current to comprehensive compensating device
The opposite electric current of electric current injects net side, so that three phase network flows into the operation of distribution substation's unity power factor, and not to three phase network
Harmonic and negative-sequence current.
The present invention can thoroughly solve the power quality problems such as the idle of railway distribution net system, harmonic wave and negative phase-sequence, realize
Safe, the green operation of railway distribution system.
Compared with prior art, advantage of the invention are as follows:
1, the present invention proposes a kind of railway distribution system comprehensive power quality device and its control method, can comprehensive treatment electricity
The idle and harmonic wave and negative phase-sequence problem not being it often fully compensated in power through track realize safe, the green fortune of railway distribution system
Row.
2, electric energy quality synthesis compensation apparatus uses modularized design, can facilitate expansion compensation capacity, meet practical application
It is required that.
Detailed description of the invention
Fig. 1 is integrated circuit schematic diagram of the present invention；
Fig. 2 is that the present invention is based on the circuit diagrams of two level H-bridge structures；
Fig. 3 is that the present invention is based on the circuit diagrams of three level H-bridge structures；
Fig. 4 is the Current Detection Algorithm block diagram of comprehensive compensating device of the present invention；
Fig. 5 is the control algolithm block diagram of comprehensive compensating device of the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
Fig. 1 is a kind of railway distribution system electric energy quality synthesis compensation apparatus proposed by the present invention.All loads of railway distribution
Pressure regulator primary side is connected to three phase network, and secondary side connects 10kV power supply through line (comprehensive through track or level-one through track), electric power perforation
It is energized on line for all kinds of loads of Along Railway.It should be noted that high-speed railway power supply through line is all made of full cable laying,
Its direct-to-ground capacitance is big, can generate biggish capacitive reactive power electric current, causes the power qualities such as the lifting of line end voltage, idle foldback
Problem.In addition, Along Railway there are a large amount of non-linear electrical equipments and single-phase power load, can generate a large amount of harmonic wave and
Negative-sequence current causes three-phase current is serious to cross distortion and three-phase imbalance.If these power quality problems are not administered not
The Electrical Safety of Along Railway equipment can be only threatened, can also inject three phase network by the Loading voltage regulator in distribution substation, so that
The power quality of three phase network declines, and threatens the safe and stable operation of public electric wire net.Existing head end concentrates+deployment scenarios along the line,
Can only compensated line part capacitive reactive power electric current, it is and poor for the compensation effect of harmonic wave and negative-sequence current, therefore the present invention
It proposes a kind of comprehensive compensating device based on power electronic technique, is asked to solve power quality present in railway distribution system
Topic.Electric energy quality synthesis compensation apparatus in Fig. 1, is made of step-down transformer and general compensator.Step-down transformer pair side around
Group number can be determined according to capacity requirement, either simplex winding, is also possible to Multiple coil.Step-down transformer primary side three, which is connected, matches
A, B, C three-phase of electric institute's 10kV Loading voltage regulator, the secondary each winding in side is again through reactor (La1~La3, Lb1~Lb3 ..., Ln1
~Ln3) connection general compensator CC1, general compensator CC2 ..., general compensator CCn, form distribution substation's comprehensive power quality
Compensation system.
It should be noted that according to actual needs, general compensator is two level blocks or more level blocks, example
Such as, the general compensator shown in Fig. 2 based on two level H-bridge structures, S11~S32 indicates switching device, A11~A13 table in figure
Show that three-phase connecting line, C1 indicate DC capacitor.
General compensator shown in Fig. 3 based on three level diode clamp H bridge structures, A21~A23 indicates three-phase in figure
Connecting line, S11~S34 indicate that switching device, D11~D21 indicate that diode, C1, C2 indicate DC capacitor.
The working principle of comprehensive compensating device CC is: the three-phase current i for flowing into distribution substation is acquired by sensorsa、isb、
iscIt is sent into digitial controller DC, digitial controller DC is divided reactive component therein, harmonic wave by certain Current Detection Algorithm
Amount and negative sequence component separate, and then by fundamental frequency control algolithm, (active reactive control algolithm, fundamental wave negative sequence inhibit to calculate
Method) and deleterious current control algolithm (harmonic wave, negative phase-sequence restrainable algorithms) output switching signal to comprehensive compensating device, control its generation
One electric current opposite with the resultant current of net side reactive current, harmonic current and negative-sequence current injects net side, so that three-phase electricity
Net flows into the operation of distribution substation's unity power factor, and not to three phase network harmonic and negative-sequence current.
The control algolithm of Current Detection Algorithm and general compensator is illustrated below:
One, Fundamental-frequency Current detection algorithm
Fig. 4 is the Fundamental-frequency Current detection algorithm block diagram of comprehensive compensating device, first acquisition distribution substation's Loading voltage regulator primary side
Electric current isa、isb、isc, three-phase power grid voltage ua、ub、uc, abc-dq and negative phase-sequence dq transformation is then converted by positive sequence dq respectively
abc--dq-Respectively obtain electric current isa、isb、iscCurrent forms i under positive-sequence coordinate system+ p、i+ qWith under negative phase-sequence coordinate system
Current forms i- p、i- q, the active and reactive positive-sequence component i of fundamental frequency is obtained being respectively fed to low-pass filter* p、i* qHave with fundamental frequency negative phase-sequence
Function, reactive component i* dN、i* qN.The sine of voltage phase angle needed for coordinate transform, cosine value in current detectingWith
The product ω t of electrical network angular frequency and time are obtained by phase-locked loop pll.
Two, Fundamental-frequency Current control algolithm and deleterious current control algolithm
Fig. 5 is the control block diagram of comprehensive compensating device, includes the control of positive sequence fundamental frequency, the control of negative phase-sequence fundamental frequency and deleterious current control
Make three parts.
The control of positive sequence fundamental frequency is combined using the double -loop control of open sea wharf, inner ring current control with dq decoupling control
Method.On the one hand use outer ring active power controller, i.e. power outer ring controller by DC side Support Capacitor voltage actual value
VdcWith given value V* dcThe d axis reference quantity i for making difference and being needed by PI controller* d, in order to enable general compensator can
Net side positive sequence active component is compensated, q axis reference quantity is set as net side positive sequence active component i* qInverse value；On the other hand in using
Circular current control, i.e. general compensator exchange side output electric current under abc-dq coordinate transform to dq coordinate and are passed through low-pass filtering
Device LPF filtering, obtains the active and reactive DC component i of positive sequence without harmonic wavedAnd iq。idWith its reference quantity i* dIt is controlled after making difference through PI
Device processed, in conjunction with active component U of the three-phase mains voltage under dq coordinatemaxWith the idle DC component i for being free of harmonic waveq, obtain
The d axis component v of the reference value of the control amount needed* d；iqWith its reference quantity i* qThrough PI controller after work difference, without the active of harmonic wave
DC component id, the q axis component v of the reference value of the control amount needed* q。v* dAnd v* qBy turning in dq-abc coordinate transform
It is melted into the reference quantity v of three-phase* a、v* b、v* c。
Similarly the control of negative phase-sequence fundamental frequency also uses dq decoupling control, i.e. general compensator exchange side output electric current is through abc--dq-
It is filtered under coordinate transform to negative phase-sequence dq coordinate and by low-pass filter LPF, obtains the negative phase-sequence active reactive direct current without harmonic wave
Component idNAnd iqN。idNWith its reference quantity i* dNThrough PI controller after work difference, in conjunction with the idle DC component i for being free of harmonic waveqN, obtain
To the d axis component v of the reference value of the control amount of needs* dN；iqNWith its reference quantity i* qNThrough PI controller after work difference, without harmonic wave
Active DC component idN, the q axis component v of the reference value of the control amount needed* qN、v* dNAnd v* qNBy in dq--abc-It sits
Shift conversion is marked into the reference quantity v of three-phase* aN、v* bN、v* cN。
Deleterious current is controlled distribution substation Loading voltage regulator primary current isa、isb、iscFundamental component under dq coordinate system
i* p、i* qIts form i under abc coordinate system is arrived by dq-abc transformationsfa、isfb、isfc, then use isa、isb、iscIt subtracts
isfa、isfb、isfcThe positive sequence harmonic current component and negative sequence harmonic current component i being not compensated forha、ihb、ihc, finally by
Proportional controller obtains the three-phase reference quantity v of Unwanted voltageha、vhb、vhc。
Finally by positive sequence voltage three-phase reference quantity v* a、v* b、v* c, negative sequence voltage three-phase reference quantity v* aN、v* bN、v* cNAnd nocuousness
Voltage three-phase reference quantity vha、vhb、vhcIt is sent into PWM modulation module after addition, obtains the switching signal of each general compensator.
The present invention can idle, harmonic wave and negative phase-sequence problem in comprehensive treatment railway distribution system, realize railway distribution system
It unites and the close friend of three-phase utility network is run.
Claims (5)
1. a kind of railway distribution system electric energy quality synthesis compensation apparatus, the comprehensive compensation including step-down transformer T and H bridge structure
The primary side three-phase port of device CC, step-down transformer T couple with the A phase, B phase, C phase of three phase network respectively, it is characterised in that: institute
The secondary side for stating step-down transformer T has one group or more of winding, and every group of winding distinguishes tandem reactor La1~La3, reactor
Lb1~Lb3 ..., access after reactor Ln1~Ln3 corresponding general compensator CC1, general compensator CC2 ..., comprehensive compensation
The input terminal of device CCn constitutes parallel connection type comprehensive compensating device；The input terminal of digitial controller DC is matched by sensor acquisition respectively
Electricity in Loading voltage regulator primary current isa、isb、iscWith three-phase power grid voltage ua、ub、ucAnd it is general compensator CC1, comprehensive
Close compensator CC2 ..., the output electric current i of general compensator CCnca1、icb1、icc1, ica2、icb2、icc2..., ican、icbn、iccn
With Support Capacitor voltage Vdc1、Vdc2、…、Vdcn；The switching signal PWM1 of digitial controller DC output end output, switching signal
PWM2 ..., switching signal PWMn be sent to corresponding general compensator CC1, general compensator CC2 ..., general compensator CCn
Control terminal.
2. a kind of railway distribution system electric energy quality synthesis compensation apparatus according to claim 1, it is characterised in that: described
General compensator CC1, general compensator CC2 in comprehensive compensating device CC ..., general compensator CCn be all made of two level H-bridges
Structure or more level H-bridge structures.
3. a kind of railway distribution system electric energy quality synthesis compensation apparatus according to claim 1, it is characterised in that: described
The vice-side winding number of step-down transformer T is equal to the general compensator number of units set according to the capacity requirement of comprehensive compensation.
4. a kind of railway distribution system electric energy quality synthesis compensation apparatus according to claim 1, it is characterised in that: described
The function of comprehensive compensating device, which is realized, to be needed according to Fundamental-frequency Current detection algorithm, first detection three-phase power grid voltage ua、ub、uc, and
Sine, the cosine value of voltage phase angle needed for obtaining coordinate transform by phase-locked loop pllWith electrical network angular frequency and
The product ω t of time；Then distribution substation's Loading voltage regulator primary current i is acquiredsa、isb、isc, and abc- is converted by positive sequence dq
Dq and negative phase-sequence dq converts abc--dq-Respectively obtain electric current isa、isb、iscCurrent forms i under positive-sequence coordinate system+ p、i+ qWith
Current forms i under negative phase-sequence coordinate system- p、i- q, then be respectively fed to low-pass filter and obtain the active and reactive positive-sequence component i of fundamental frequency* p、
i* qWith the active and reactive component i of fundamental frequency negative phase-sequence* dN、i* qN, to realize positive sequence fundamental current, negative phase-sequence fundamental current and positive and negative sequence
The separation of harmonic current.
5. a kind of control method of railway distribution system electric energy quality synthesis compensation apparatus includes the control of positive sequence fundamental frequency, negative phase-sequence base
Frequency control and deleterious current control three parts, and the control of positive sequence fundamental frequency passes through acquisition general compensator CC1, general compensator
CC2 ..., the output electric current i of general compensator CCnca1、icb1、icc1, ica2、icb2、icc2..., ican、icbn、iccnWith exchange side
Voltage ua、ub、ucAnd DC side Support Capacitor voltage Vdc1、Vdc2..., Vdcn, then pass through open sea wharf, interior circular current control
The double -loop control of system generates the three-phase reference quantity v of positive sequence voltage with the mode that dq decoupling control combines* a、v* b、v* c；Negative phase-sequence base
Frequency control by acquisition general compensator CC1, general compensator CC2 ..., the output electric current i of general compensator CCnca1、icb1、
icc1, ica2、icb2、icc2..., ican、icbn、iccn, then negative sequence voltage three-phase reference quantity is generated by way of dq decoupling control
v* aN、v* bN、v* cN；Deleterious current is controlled distribution substation Loading voltage regulator primary current isa、isb、iscFundamental frequency under dq coordinate system
Component i* p、i* qIts form i under abc coordinate system is arrived by dq-abc transformationsfa、isfb、isfc, then use isa、isb、isc
Subtract isfa、isfb、isfcThe positive sequence harmonic current component and negative sequence harmonic current component i being not compensated forha、ihb、ihc, finally
The three-phase reference quantity v of Unwanted voltage is obtained by proportional controllerha、vhb、vhc.Finally by positive sequence voltage three-phase reference quantity v* a、
v* b、v* c, negative sequence voltage three-phase reference quantity v* aN、v* bN、v* cNWith Unwanted voltage three-phase reference quantity vha、vhb、vhcIt is sent into after addition
PWM modulation module obtains the switching signal of each general compensator.
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| CN201910762339.8A CN110350542B (en) | 2019-08-19 | 2019-08-19 | Comprehensive compensation device for electric energy quality of railway distribution system and control method thereof |
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| CN201910762339.8A CN110350542B (en) | 2019-08-19 | 2019-08-19 | Comprehensive compensation device for electric energy quality of railway distribution system and control method thereof |
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| CN110350542B CN110350542B (en) | 2024-02-06 |
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